Facilitated diffusion is a passive transport process where substances move from high to low concentration through protein channels, without using cellular energy. It is similar to simple diffusion but involves specific proteins that act as channels or tunnels, allowing substances to pass through the cell membrane efficiently.

What is the main difference between facilitated diffusion and simple diffusion?

• Facilitated diffusion requires energy.

• Facilitated diffusion involves movement against the concentration gradient.

• Facilitated diffusion uses proteins as channels.

• Facilitated diffusion occurs only in plant cells.

In facilitated diffusion, substances move from:

• Inside to outside the cell

• High to low concentration

• Outside to inside the cell

• Low to high concentration

What role do proteins play in facilitated diffusion?

• They provide energy for the process.

• They prevent diffusion from occurring.

• They change the concentration gradient.

• They act as channels or tunnels for substances.

Which of the following statements is true about facilitated diffusion?

• It is an active transport process.

• It only occurs in animal cells.

• It requires cellular energy.

• It is a passive process.

Why is no energy required in facilitated diffusion?

• Because it moves substances against the concentration gradient.

• Because it uses proteins to move substances.

• Because it moves substances from high to low concentration.

• Because it only occurs in the presence of light.